Santa's Gifts to Nice PCs: Magic Items 1 – Keelor's Eye

Getting into the gift giving spirit I thought I'd post some magic items over Christmas/New Year, here's the first:

Keelor's Eye

This sphere is around 3 inches in diameter and made of a clear substance, tougher than glass. Inside there is a severed eyeball, suspended in fluid, that follows you as you handle the sphere.The eye is blue.

If the user holds the sphere to their eye then they can see through illusions as if they had cast the Cleric spell True Seeing. The effects last for up to 10 minutes of viewing a week.